﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information
// 
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to you under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
// 
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// 

#if NET_3_5 || NET_4_0 || MONO_3_5 || MONO_4_0 || NETSTANDARD

using System;

using log4net.Core;

namespace log4net.Util
{
    /// <summary>
    /// The static class ILogExtensions contains a set of widely used
    /// methods that ease the interaction with the ILog interface implementations.
    /// </summary>
    /// <remarks>
    /// <para>
    /// This class contains methods for logging at different levels and checks the
    /// properties for determining if those logging levels are enabled in the current
    /// configuration.
    /// </para>
    /// </remarks>
    /// <example>Simple example of logging messages
    /// <code lang="C#">
    /// using log4net.Util;
    /// 
    /// ILog log = LogManager.GetLogger("application-log");
    /// 
    /// log.InfoExt("Application Start");
    /// log.DebugExt("This is a debug message");
    /// </code>
    /// </example>
    public static class ILogExtensions
    {
        /// <summary>The fully qualified type of the Logger class.</summary>
        private static readonly Type declaringType = typeof(ILogExtensions);

        /// <summary>Log a message object with the <see cref="Level.Debug"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>INFO</c>
        /// enabled by reading the value <seealso cref="ILog.IsDebugEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation.  If this logger is <c>INFO</c> enabled, then it converts 
        /// the message object (retrieved by invocation of the provided callback) to a 
        /// string by invoking the appropriate <see cref="log4net.ObjectRenderer.IObjectRenderer"/>.
        /// It then proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="DebugExt(ILog,Func{object},Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugExt(this ILog logger, Func<object> callback)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.Debug(callback());
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Debug"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="DebugExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugExt(this ILog logger, Func<object> callback, Exception exception)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.Debug(callback(), exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <overloads>Log a message object with the <see cref="Level.Debug"/> level.</overloads> //TODO
        /// <summary>Log a message object with the <see cref="Level.Debug"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>INFO</c>
        /// enabled by reading the value <seealso cref="ILog.IsDebugEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation. If this logger is <c>INFO</c> enabled, then it converts 
        /// the message object (passed as parameter) to a string by invoking the appropriate
        /// <see cref="log4net.ObjectRenderer.IObjectRenderer"/>. It then 
        /// proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="DebugExt(ILog,object,Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugExt(this ILog logger, object message)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.Debug(message);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Debug"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="DebugExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugExt(this ILog logger, object message, Exception exception)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.Debug(message, exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Debug"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="DebugExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugFormatExt(this ILog logger, string format, object arg0)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.DebugFormat(format, arg0);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Debug"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="DebugExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugFormatExt(this ILog logger, string format, params object[] args)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.DebugFormat(format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Debug"/> level.</summary>
        /// <param name="provider">An <see cref="IFormatProvider"/> that supplies culture-specific formatting information</param>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="DebugExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugFormatExt(this ILog logger, IFormatProvider provider, string format, params object[] args)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.DebugFormat(provider, format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Debug"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="DebugExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugFormatExt(this ILog logger, string format, object arg0, object arg1)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.DebugFormat(format, arg0, arg1);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Debug"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <param name="arg2">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="DebugExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Debug(object)"/>
        /// <seealso cref="ILog.IsDebugEnabled"/>
        public static void DebugFormatExt(this ILog logger, string format, object arg0, object arg1, object arg2)
        {
            try
            {
                if (!logger.IsDebugEnabled)
                {
                    return;
                }

                logger.DebugFormat(format, arg0, arg1, arg2);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Log a message object with the <see cref="Level.Info"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>INFO</c>
        /// enabled by reading the value <seealso cref="ILog.IsInfoEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation.  If this logger is <c>INFO</c> enabled, then it converts 
        /// the message object (retrieved by invocation of the provided callback) to a 
        /// string by invoking the appropriate <see cref="log4net.ObjectRenderer.IObjectRenderer"/>.
        /// It then proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="InfoExt(ILog,Func{object},Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoExt(this ILog logger, Func<object> callback)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.Info(callback());
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Info"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="InfoExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoExt(this ILog logger, Func<object> callback, Exception exception)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.Info(callback(), exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <overloads>Log a message object with the <see cref="Level.Info"/> level.</overloads> //TODO
        /// <summary>Log a message object with the <see cref="Level.Info"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>INFO</c>
        /// enabled by reading the value <seealso cref="ILog.IsInfoEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation. If this logger is <c>INFO</c> enabled, then it converts 
        /// the message object (passed as parameter) to a string by invoking the appropriate
        /// <see cref="log4net.ObjectRenderer.IObjectRenderer"/>. It then 
        /// proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="InfoExt(ILog,object,Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoExt(this ILog logger, object message)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.Info(message);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Info"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="InfoExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoExt(this ILog logger, object message, Exception exception)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.Info(message, exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Info"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="InfoExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoFormatExt(this ILog logger, string format, object arg0)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.InfoFormat(format, arg0);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Info"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="InfoExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoFormatExt(this ILog logger, string format, params object[] args)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.InfoFormat(format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Info"/> level.</summary>
        /// <param name="provider">An <see cref="IFormatProvider"/> that supplies culture-specific formatting information</param>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="InfoExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoFormatExt(this ILog logger, IFormatProvider provider, string format, params object[] args)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.InfoFormat(provider, format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Info"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="InfoExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoFormatExt(this ILog logger, string format, object arg0, object arg1)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.InfoFormat(format, arg0, arg1);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Info"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <param name="arg2">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="InfoExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Info(object)"/>
        /// <seealso cref="ILog.IsInfoEnabled"/>
        public static void InfoFormatExt(this ILog logger, string format, object arg0, object arg1, object arg2)
        {
            try
            {
                if (!logger.IsInfoEnabled)
                {
                    return;
                }

                logger.InfoFormat(format, arg0, arg1, arg2);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Log a message object with the <see cref="Level.Warn"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>WARN</c>
        /// enabled by reading the value <seealso cref="ILog.IsWarnEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation.  If this logger is <c>WARN</c> enabled, then it converts 
        /// the message object (retrieved by invocation of the provided callback) to a 
        /// string by invoking the appropriate <see cref="log4net.ObjectRenderer.IObjectRenderer"/>.
        /// It then proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="WarnExt(ILog,Func{object},Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnExt(this ILog logger, Func<object> callback)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.Warn(callback());
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Warn"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="WarnExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnExt(this ILog logger, Func<object> callback, Exception exception)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.Warn(callback(), exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <overloads>Log a message object with the <see cref="Level.Warn"/> level.</overloads> //TODO
        /// <summary>Log a message object with the <see cref="Level.Warn"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>WARN</c>
        /// enabled by reading the value <seealso cref="ILog.IsWarnEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation. If this logger is <c>WARN</c> enabled, then it converts 
        /// the message object (passed as parameter) to a string by invoking the appropriate
        /// <see cref="log4net.ObjectRenderer.IObjectRenderer"/>. It then 
        /// proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="WarnExt(ILog,object,Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnExt(this ILog logger, object message)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.Warn(message);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Warn"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="WarnExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnExt(this ILog logger, object message, Exception exception)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.Warn(message, exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Warn"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="WarnExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnFormatExt(this ILog logger, string format, object arg0)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.WarnFormat(format, arg0);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Warn"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="WarnExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnFormatExt(this ILog logger, string format, params object[] args)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.WarnFormat(format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Warn"/> level.</summary>
        /// <param name="provider">An <see cref="IFormatProvider"/> that supplies culture-specific formatting information</param>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="WarnExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnFormatExt(this ILog logger, IFormatProvider provider, string format, params object[] args)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.WarnFormat(provider, format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Warn"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="WarnExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnFormatExt(this ILog logger, string format, object arg0, object arg1)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.WarnFormat(format, arg0, arg1);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Warn"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <param name="arg2">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="WarnExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Warn(object)"/>
        /// <seealso cref="ILog.IsWarnEnabled"/>
        public static void WarnFormatExt(this ILog logger, string format, object arg0, object arg1, object arg2)
        {
            try
            {
                if (!logger.IsWarnEnabled)
                {
                    return;
                }

                logger.WarnFormat(format, arg0, arg1, arg2);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Log a message object with the <see cref="Level.Error"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>ERROR</c>
        /// enabled by reading the value <seealso cref="ILog.IsErrorEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation.  If this logger is <c>ERROR</c> enabled, then it converts 
        /// the message object (retrieved by invocation of the provided callback) to a 
        /// string by invoking the appropriate <see cref="log4net.ObjectRenderer.IObjectRenderer"/>.
        /// It then proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="ErrorExt(ILog,Func{object},Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorExt(this ILog logger, Func<object> callback)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.Error(callback());
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Error"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="ErrorExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorExt(this ILog logger, Func<object> callback, Exception exception)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.Error(callback(), exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <overloads>Log a message object with the <see cref="Level.Error"/> level.</overloads> //TODO
        /// <summary>Log a message object with the <see cref="Level.Error"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>ERROR</c>
        /// enabled by reading the value <seealso cref="ILog.IsErrorEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation. If this logger is <c>ERROR</c> enabled, then it converts 
        /// the message object (passed as parameter) to a string by invoking the appropriate
        /// <see cref="log4net.ObjectRenderer.IObjectRenderer"/>. It then 
        /// proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="ErrorExt(ILog,object,Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorExt(this ILog logger, object message)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.Error(message);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Error"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="ErrorExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorExt(this ILog logger, object message, Exception exception)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.Error(message, exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Error"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="ErrorExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorFormatExt(this ILog logger, string format, object arg0)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.ErrorFormat(format, arg0);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Error"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="ErrorExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorFormatExt(this ILog logger, string format, params object[] args)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.ErrorFormat(format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Error"/> level.</summary>
        /// <param name="provider">An <see cref="IFormatProvider"/> that supplies culture-specific formatting information</param>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="ErrorExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorFormatExt(this ILog logger, IFormatProvider provider, string format, params object[] args)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.ErrorFormat(provider, format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Error"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="ErrorExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorFormatExt(this ILog logger, string format, object arg0, object arg1)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.ErrorFormat(format, arg0, arg1);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Error"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <param name="arg2">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="ErrorExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Error(object)"/>
        /// <seealso cref="ILog.IsErrorEnabled"/>
        public static void ErrorFormatExt(this ILog logger, string format, object arg0, object arg1, object arg2)
        {
            try
            {
                if (!logger.IsErrorEnabled)
                {
                    return;
                }

                logger.ErrorFormat(format, arg0, arg1, arg2);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Log a message object with the <see cref="Level.Fatal"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>FATAL</c>
        /// enabled by reading the value <seealso cref="ILog.IsFatalEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation.  If this logger is <c>FATAL</c> enabled, then it converts 
        /// the message object (retrieved by invocation of the provided callback) to a 
        /// string by invoking the appropriate <see cref="log4net.ObjectRenderer.IObjectRenderer"/>.
        /// It then proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="FatalExt(ILog,Func{object},Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalExt(this ILog logger, Func<object> callback)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.Fatal(callback());
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Fatal"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="callback">The lambda expression that gets the object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="FatalExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalExt(this ILog logger, Func<object> callback, Exception exception)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.Fatal(callback(), exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <overloads>Log a message object with the <see cref="Level.Fatal"/> level.</overloads> //TODO
        /// <summary>Log a message object with the <see cref="Level.Fatal"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <remarks>
        /// <para>
        /// This method first checks if this logger is <c>FATAL</c>
        /// enabled by reading the value <seealso cref="ILog.IsFatalEnabled"/> property.
        /// This check happens always and does not depend on the <seealso cref="ILog"/>
        /// implementation. If this logger is <c>FATAL</c> enabled, then it converts 
        /// the message object (passed as parameter) to a string by invoking the appropriate
        /// <see cref="log4net.ObjectRenderer.IObjectRenderer"/>. It then 
        /// proceeds to call all the registered appenders in this logger 
        /// and also higher in the hierarchy depending on the value of 
        /// the additivity flag.
        /// </para>
        /// <para><b>WARNING</b> Note that passing an <see cref="Exception"/> 
        /// to this method will print the name of the <see cref="Exception"/> 
        /// but no stack trace. To print a stack trace use the 
        /// <see cref="FatalExt(ILog,object,Exception)"/> form instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalExt(this ILog logger, object message)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.Fatal(message);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>
        /// Log a message object with the <see cref="Level.Fatal"/> level including
        /// the stack trace of the <see cref="Exception"/> passed
        /// as a parameter.
        /// </summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="message">The message object to log.</param>
        /// <param name="exception">The exception to log, including its stack trace.</param>
        /// <remarks>
        /// <para>
        /// See the <see cref="FatalExt(ILog, object)"/> form for more detailed information.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalExt(this ILog logger, object message, Exception exception)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.Fatal(message, exception);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Fatal"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="FatalExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalFormatExt(this ILog logger, string format, object arg0)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.FatalFormat(format, arg0);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Fatal"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="FatalExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalFormatExt(this ILog logger, string format, params object[] args)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.FatalFormat(format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Fatal"/> level.</summary>
        /// <param name="provider">An <see cref="IFormatProvider"/> that supplies culture-specific formatting information</param>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="args">An Object array containing zero or more objects to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="FatalExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalFormatExt(this ILog logger, IFormatProvider provider, string format, params object[] args)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.FatalFormat(provider, format, args);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Fatal"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="FatalExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalFormatExt(this ILog logger, string format, object arg0, object arg1)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.FatalFormat(format, arg0, arg1);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }

        /// <summary>Logs a formatted message string with the <see cref="Level.Fatal"/> level.</summary>
        /// <param name="logger">The logger on which the message is logged.</param>
        /// <param name="format">A String containing zero or more format items</param>
        /// <param name="arg0">An Object to format</param>
        /// <param name="arg1">An Object to format</param>
        /// <param name="arg2">An Object to format</param>
        /// <remarks>
        /// <para>
        /// The message is formatted using the <c>String.Format</c> method. See
        /// <see cref="String.Format(string, object[])"/> for details of the syntax of the format string and the behavior
        /// of the formatting.
        /// </para>
        /// <para>
        /// This method does not take an <see cref="Exception"/> object to include in the
        /// log event. To pass an <see cref="Exception"/> use one of the <see cref="FatalExt(ILog,object,Exception)"/>
        /// methods instead.
        /// </para>
        /// </remarks>
        /// <seealso cref="ILog.Fatal(object)"/>
        /// <seealso cref="ILog.IsFatalEnabled"/>
        public static void FatalFormatExt(this ILog logger, string format, object arg0, object arg1, object arg2)
        {
            try
            {
                if (!logger.IsFatalEnabled)
                {
                    return;
                }

                logger.FatalFormat(format, arg0, arg1, arg2);
            }
            catch (Exception ex)
            {
                LogLog.Error(declaringType, "Exception while logging", ex);
            }
        }
    }
}
#endif
